What color are blueberries?

Vaccinium myrtillus or European blueberry is a holarctic species of shrub with edible fruit of blue color, known by the common names bilberry, blaeberry, wimberry, and whortleberry. It is more precisely called common bilberry or blue whortleberry to distinguish it from other Vaccinium relatives.

The fruits will stain hands, teeth and tongue deep blue or purple while eating and so it was traditionally used as a dye for food and clothes in Britain.

Vaccinium myrtillus has been used for centuries in traditional medicine, particularly in traditional Austrian medicine as a tea or liqueur in attempts to treat various disorders. Bilberry dietary supplements are marketed in the United States, although there is little evidence these products have any effect on health or diseases.

In cooking, the bilberry fruit is commonly used for pies, tarts and flans, cakes, jams, muffins, cookies, sauces, syrups, juices, and candies.